JP5279100B1 - Non-open exchanging method of buried pipe and its structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a non-open-cut replacement method and a structure of an embedded pipe that can be pulled by cutting a diameter expanding tool without buckling or displacing the existing pipe.
In the present invention, a traction reaction force receiving means is provided at the tip of an existing pipe or the inner surface of the arrival pit in the arrival pit to receive the traction reaction force of the cutting diameter expanding tool. Connected to the base end side of the pipe, an existing pipe holding means for applying an external force in the opposite direction to the existing pipe in response to the force applied to the existing pipe by the pulled cutting diameter expanding tool is provided to move the existing pipe. It is characterized by restricting displacement.
[Selection] Figure 1

Description

  The present invention relates to a non-open-cut replacement method and a structure of a buried pipe that is replaced by a new pipe while cutting an existing pipe by cutting a diameter expanding tool through the existing pipe without digging, and buckling or displacing the existing pipe. The existing pipe can be torn by pulling the cutting tool.

The pipe splitter method is a method of tearing an existing pipe with a cutting and expanding tool such as Japanese Patent No. 3217403 and Japanese Patent No. 4081506, and pulling in a new polyethylene pipe while expanding the diameter. Therefore, it has been actively introduced from the viewpoint of reducing the environmental burden by reducing the excavation area and the construction cost.
The retracting machine of the above construction method is constructed by pressing the tip of an existing pipe and drawing the cutting diameter expanding tool through the existing pipe using the force as a reaction force.
Therefore, the end part of the existing pipe on the retracting machine side will bite into the existing pipe end part without allowing the cutting diameter expansion tool to pass through, so the end part of the existing pipe is cut off and removed using a large hammer or heavy equipment. The work which removes an existing pipe and a cutting diameter expansion tool has generate | occur | produced, and the improvement of workability | operativity and safety was calculated | required.

Thus, for example, in the traction device disclosed in Japanese Patent Application Laid-Open No. 2002-227589, a first transmission tool (a pair of left and right arms) capable of transmitting the traction reaction force of the retracting machine to the tip 41 side of the existing pipe 40 exposed inside the pit. 5 'and a hooking portion 6' at the tip thereof, and a second transmission tool (such as a frame 3 ') capable of transmitting the traction reaction force to the inner surface side of the pit, the second transmission tool, Inside the pit, on the upper side in the pulling direction of the retracting machine, the tube breaking tool (corresponding to a cutting diameter expanding tool) is provided so as to be able to be secured so as to be able to be pulled out over substantially the entire length, 1 Transmitting tool is moved between a receiving position where the other end of the existing pipe can be received from the longitudinal direction of the pipe, and a retracted position where the receiving is released and the pipe breaking tool pulled out to the inside of the pit does not interfere. The structure is provided freely.
However, in the above configuration, when the tube breaker is pulled to the vicinity of the existing pipe, the first transmission tool that has collided with the tip of the existing pipe is a retreated position in which the arm is separated to pull out the tube breaker. Therefore, after that, the tip of the existing pipe is in a free state, and the pipe breaker is pulled only by the second transmission member such as the frame such as a rod.
Therefore, even if a slightly biased force is applied during traction, the traction reaction force is not transmitted evenly to the existing pipe, and the existing pipe is tilted and the tube breaker is clogged, or the tube breaker is tilted and the pipe breaker is placed in the existing pipe. There is a problem that the conventional defect cannot be solved.
In view of this, the retracting devices of Japanese Patent No. 4107615 and Japanese Patent Application Laid-Open No. 2011-99273 have been proposed and have achieved considerable results.

Japanese Patent Laid-Open No. 2002-227589 See FIG. JP 2011-99273 A

  The present invention has been made in view of the above circumstances, and when passing a cutting diameter expanding tool through an existing pipe, an external force in the opposite direction is applied to the existing pipe in response to the force applied to the existing pipe by pulling the cutting diameter expanding tool. In addition, even if a biased force is applied when the cutting tool is pulled, the posture of the existing pipe is maintained, so that the cutting tool does not clog the existing pipe and prevents buckling of the existing pipe. An object of the present invention is to provide a non-cutting replacement method for buried pipes and a structure thereof.

In order to solve the above problem, the invention of claim 1
A new construction in which a cutting diameter expansion tool inserted from one end of an existing pipe that has been buried is pulled to the other end by a traction device, and the existing pipe wall is connected to the cutting diameter expansion tool while tearing and expanding the diameter along the pulling direction. existing pipe hold back means the tube in response to force applied to the existing pipe by a draw in cutting diameter expanding tool to the towed is connected to the base end side of the existing pipe when Ru replacing external force is applied in the opposite direction to the existing pipe In the non-open-cut replacement method for buried pipes,
The existing pipe retaining means has a connector fixed to the proximal end side of the existing pipe and connected to the tip of the wire or chain, and is supported in a state where the wire or chain is tensioned. To do.
In the invention of claim 2,
It has a pull-in device that draws the cutting diameter expansion tool from the tip of the existing pipe,
In leading the cutting diameter expanding tool by traction of the traction device, characterized in that provided towing reaction force receiving means to the drawing device comprising subjected to traction reaction force of the cutting diameter expanding tool.
In the invention of claim 3 ,
A new construction in which a cutting diameter expansion tool inserted from one end of an existing pipe that has been buried is pulled to the other end by a traction device, and the existing pipe wall is connected to the cutting diameter expansion tool while tearing and expanding the diameter along the pulling direction. Existing pipe retaining means for applying an external force in the opposite direction to the existing pipe in response to the force applied to the existing pipe by the towing cutting diameter expanding tool connected to the proximal end side of the existing pipe when the pipe is drawn and replaced In the non-open-cut replacement structure for buried pipes with
The existing pipe retaining means has a connector fixed to the proximal end side of the existing pipe and connected to the tip of the wire or chain, and is supported in a state where the wire or chain is tensioned. To do.
In the invention of claim 4 ,
The existing pipe retaining means connects the chuck portion connected to the distal end of one or a plurality of wires or chains to the proximal end side of the existing pipe, and fixes the wires or chains in a state of being strained rearward, or rearward It is characterized by having a structure that is pulled by
In the invention of claim 5,
In the reaching pit, a traction reaction force receiving means is provided at the tip of the existing pipe or the inner surface of the reaching pit to receive the traction reaction force of the cutting diameter expanding tool,
The existing pipe retaining means is provided in the start pit to restrict the movement and displacement of the existing pipe.

  The present invention provides a traction reaction force receiving means on the end of an existing pipe or the inner surface of a pit when the cutting diameter expanding tool is towed from the existing pipe so as to receive the traction reaction force of the cutting diameter expanding tool. By applying an external force in the direction opposite to the pulling direction of the cutting diameter expansion tool to the existing pipe retaining device, even if a biased force acts when pulling the cutting diameter expansion tool, the posture of the existing pipe can be maintained. The cutting diameter expanding tool can be clogged in the existing pipe or buckling of the existing pipe can be prevented, and the cutting diameter expanding tool can be smoothly collected in the pit.

It is a schematic diagram of the non-cutting replacement structure of a buried pipe. It is a top view which shows the traction device and the drawing-in device on the arrival pit side. It is a top view which shows the Example from which a drawing-in apparatus differs. It is a top view which shows an example of the existing pipe retainer. It is a side view which shows another example of the existing pipe retaining apparatus.

  In the following, an embodiment in which the non-cutting replacement method for buried pipes and the apparatus of the present invention are applied to the pipe splitter method for buried pipes for gas supply will be described with reference to the drawings.

[Non-cutting replacement method for buried pipes]
As shown in FIG. 1, the non-cut-off replacement method of the buried pipe of this embodiment is an improvement of the four-pipe splitter method, and the starting pit P1 and the reaching pit are provided at both ends of the existing pipe 11 embedded in the replacement range. P2 is excavated, and the end portions 11a and 11b of the existing pipe 11 are projected into the pits P1 and P2, the traction device 2 and the retracting device 1 are disposed in the arrival pit P2, and the existing pit P1 is provided. A tube retaining device 6 is arranged.

In this embodiment, a wire 2a (may be a rod that can be added and separated) is passed through the existing pipe 11 as a pulling member, and a cutting diameter increasing tool 4 is provided at the tip of the wire 2a on the start pit P1 side. The new pipe (PE pipe) 12 is connected through the via.
Next, the wire 2a is pulled to the arrival pit P2 side by the pulling device 2, and a single cut is formed in the existing pipe 11 by the cutting and expanding tool 4 and is cut in the longitudinal direction. The tube 12 is retracted.

  In the present embodiment, the traction device 2 is connected in the reaching pit P2 via the retracting device 1, and these are constrained in the reaching pit P2, and the abutting surface of the inner wall surface of the reaching pitch or the end portion 11b of the existing pipe 11 is connected. However, the present invention can also be applied to an arrangement in which only the traction device 2 is constrained in the arrival pit P2 as described later.

In this way, the wire 2a is pulled to the arrival pit P2 side by the traction device 2, and the existing pipe 11 is cut in the longitudinal direction by the cutting diameter increasing tool 4 as described above, and the new pipe is expanded while expanding the hollow of the existing pipe 11. 12, the replacement is completed through the new pipe 12 over the entire length of the existing pipe 11 in the replacement range.
In this embodiment, since the retractor 1 is provided, the cutting diameter increasing tool 4 can be easily pulled out from the end of the existing pipe 11 into the arrival pit P2.

[Retraction device]
A known configuration can be used for the retracting device 1 to which the traction device 2 is connected.
As shown in FIGS. 2 and 3, the retracting device 1 is connected to the traction device 2 and extends in the traction direction, and has a space S <b> 1 that can accommodate the entire cutting diameter increasing tool 4 serving as a head. It has a structure in which one or a plurality of box-shaped frames each having an opening S2 from which a cutting diameter increasing tool 4 can be taken out are connected.

  The retracting device 1 is pivoted toward the protruding position of the tip 11b of the existing pipe 11 which is pivotally attached to the left and right side surfaces of the frame 1A adjacent to the reaching pit P2 and exposed inside the reaching pit P2. A pair of movable support arms 5 is provided.

  And since the said frame 1A collides with the inner wall surface 21 which the front-end | tip 11b of the existing pipe 11 of the arrival pit P2 protrudes directly or indirectly through a block or plate B1, etc., the traction reaction force of a traction device Is transmitted to the inner wall surface 21 of the arrival pit P2.

In FIG. 2, the traction reaction force of the traction device 2 can be transmitted to the existing pipe 11 by holding the plate B <b> 2 that is hooked to the tip 11 b of the existing pipe 11 on the support arm 5 as in JP 2011-99273 A. In FIG. 3, the tip 11 b of the existing pipe 11 is directly latched by the support arm 5 as in JP-A-2002-227589, and the traction reaction force of the traction device 2 can be transmitted to the existing pipe 11.

[Towing device]
In the present embodiment, the traction device 2 has a cylinder configuration in which the wires 2a are sequentially hooked and expanded and contracted. However, the traction device 2 may have a rotating drum structure that winds the wires 2a, and the traction member is a rod. Alternatively, a hydraulic pusher that pushes and pulls the rod may be used.

When the pulling device 1 is not provided and only the pulling device 2 is used directly (not shown), the pulling device 2 is constrained with the inner wall surface 21 by restraining the pulling device 2 in the arrival pit P2 via a fixing member. The restraining member and the abutting member to be subjected to the earth pressure of the inner wall surface 21 receive the traction reaction force of the traction device 2.
In addition, in this invention, the structure of the traction apparatus and the drawing-in apparatus in the arrival pit P2 is not specifically limited, A well-known structure can be used.

[Existing pipe retaining device]
On the other hand, the base end 11a of the existing pipe 11 projects into the transmission pit P1.
An existing pipe retaining device 6 is connected to the base end 11 a of the existing pipe 11 so that an external force in a direction opposite to the pulling direction of the pulling apparatus 2 is applied to the existing pipe 11.

The existing pipe retaining device 6 shown in FIGS. 4 and 5 includes a base portion 60 made of a frame and a retaining member 61 provided on the base portion 61.
The retaining member 61 has a distal end fixed or locked to the proximal end 11a of the existing tube 11 so as to be detachable. Even if a force is applied to the existing tube 11 in the pulling direction with the proximal end fixed at a predetermined position, the existing tube 11 However, the present invention is not limited to the following examples.

  In the present embodiment, the retaining member 61 includes a chuck portion 62 as an example of a connecting tool connected to the base end 11a of the existing pipe 11, and two chains 63 (including a wire and a brazing material) provided with the chuck portion 62. And a lock lever 64 which is attached to the base portion 61 and tensions and locks the chain 63.

  Each chain 63 is configured to fix the chuck portion 62 to the left and right of the existing pipe 11 as shown in FIG. 4 or to fix the chuck portion 62 to the upper and lower sides of the existing pipe 11 as shown in FIG. Can do.

The chain 63 having the coupling tool 62 may be one, or three or more. When the existing pipe 11 is pulled by the cutting diameter expanding tool 4 pulled inside the existing pipe 11 by the traction device 2, this force is supported. As long as an external force in the opposite direction is applied to the existing pipe 11, the number and direction of pulling the existing pipe 11 are not limited to the illustrated example.
In the illustrated example, the chain 63 is fixed in a tension state in the start pit P1, but is detachably connected to a heavy object such as a building, a machine, or a vehicle outside the start pit P1 and supported in a tension state. You may do it.

The external force applied to the existing pipe 11 by the existing pipe retaining device 6 only needs to act as a reaction force against the force applied to the existing pipe 11.
Further, the base portion 61 is brought into contact with the inner wall surface of the starting pit P1 directly by the frame body or indirectly through the block B or the plate between the frame body and the existing pipe retaining device 6. The reaction force with respect to the existing pipe 11 is transmitted.

As a result, both sides of the base end of the existing pipe 11 which are cut open are fastened by the chuck portions 62, the chains 63 of the chuck portions 62 are strongly tensioned by the lock levers 64, and locked by the lock levers 64 at the tension positions. .
Thereby, the force in the pulling direction acts on the existing pipe 11 via the cutting diameter expanding tool 4 by the pulling force of the pulling device 2, but the existing pipe 11 is restrained by the existing pipe retaining device 6, so the existing pipe 11 Can remain stationary.
Therefore, the cutting diameter expanding tool 4 is blocked in the existing pipe 11 or buckling of the existing pipe 11 is prevented, and the cutting diameter expanding tool 4 can smoothly move in the existing pipe 11 and tear the existing pipe 11. it can.

  In addition, the present invention is not limited to the above-described embodiments, and it goes without saying that various design changes can be made without changing the gist of the present invention.

DESCRIPTION OF SYMBOLS 1 Pulling-in apparatus 1a Frame body 2 Pulling apparatus 2a Wire as an example of a pulling member 3 Pulling-in apparatus 4 Cutting diameter expansion tool 5 Support arm 6 Existing pipe retaining apparatus 11 Existing pipe 11a Base end 11b of existing pipe New tip 12 of existing pipe Pipe 21 Inner wall surface 60 having reached pitch Base portion 61 Holding member 62 Chuck portion 63 Chain 64 Lock lever

Claims (5)

A new construction in which a cutting diameter expansion tool inserted from one end of an existing pipe that has been buried is pulled to the other end by a traction device, and the existing pipe wall is connected to the cutting diameter expansion tool while tearing and expanding the diameter along the pulling direction. existing pipe hold back means the tube in response to force applied to the existing pipe by a draw in cutting diameter expanding tool to the towed is connected to the base end side of the existing pipe when Ru replacing external force is applied in the opposite direction to the existing pipe In the non-open-cut replacement method for buried pipes,
The existing pipe retaining means has a connector fixed to the proximal end side of the existing pipe and connected to the tip of the wire or chain, and is supported in a state where the wire or chain is tensioned. Non-open-cut replacement method for buried pipes. It has a pull-in device that draws the cutting diameter expansion tool from the tip of the existing pipe,
In leading the cutting diameter expanding tool by traction of traction devices, embedded according to claim 1, characterized by comprising subjecting the traction reaction force of the cutting diameter expanding tool provided towing reaction force receiving means drawing device Non-open cutting replacement method for pipes. A new construction in which a cutting diameter expansion tool inserted from one end of an existing pipe that has been buried is pulled to the other end by a traction device, and the existing pipe wall is connected to the cutting diameter expansion tool while tearing and expanding the diameter along the pulling direction. Existing pipe retaining means for applying an external force in the opposite direction to the existing pipe in response to the force applied to the existing pipe by the towing cutting diameter expanding tool connected to the proximal end side of the existing pipe when the pipe is drawn and replaced In the non-open-cut replacement structure for buried pipes with
The existing pipe retaining means has a connector fixed to the proximal end side of the existing pipe and connected to the tip of the wire or chain, and is supported in a state where the wire or chain is tensioned. Non-open cut replacement structure for installation pipes. The existing pipe retaining means connects the chuck portion connected to the distal end of one or a plurality of wires or chains to the proximal end side of the existing pipe, and fixes the wires or chains in a state of being strained rearward, or rearward The structure according to claim 3 , wherein the structure is a structure that is pulled to the left. In the reaching pit, a traction reaction force receiving means is provided at the tip of the existing pipe or the inner surface of the reaching pit to receive the traction reaction force of the cutting diameter expanding tool,
5. The non-cutting replacement structure for an embedded pipe according to claim 3 or 4, wherein an existing pipe retaining means is provided in the starting pit to restrict movement and displacement of the existing pipe.

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